[FFmpeg-devel] [PATCH] ffmpeg_filter: use nb_threads=1 on unused filtergraph

[DeHackEd]

Hello,

Simple one-line patch to avoid creating threads on a filtergrpah which does not
get used during execution. This saves a superfluous thread creation and
tear-down cycle.

Besides cleanliness, the main driver for this feature is a system I have access
to with a large number of cores/threads. Threads count towards ulimits and the
default of 1 filtergraph thread per CPU thread is undesirable.
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